It's the same host and same application. Credit droped from 17.1cr/h to 5.5cr/h CPU time. (Other projects grant in general about 20-25 cr/h, with some spikes in both directions.)
Is any explanation of the drop of credits from server side available?
(I didn't observe such a drop in my other projects in the last days, thus it must be something specific to NumberFields@home.)